4 SMi'lHSONlAX MISCELLAXKOUS C<^LLKCTION.S VOL, yi 



Islands, and southward alotig the coast of North America to Panama 

 and the Galapagos Islands, in from 184 to 1,617 fathoms of water. 

 The new sjiecies, P. acuta, appears to be most closely related to 

 P. major and P. inira, which are found on the western coast of the 

 Malay Peninsula and southward to the Lesser Sunda Islands in 185 to 

 434 fathoms of water. These agree with P. acuta in having two and a 

 partial third coliunn of cirrus sockets in each radial area on the 

 oentrodorsal, but in both of them the radial areas on the centrodorsal 

 are conspicuously delimited by broad grooves or bare lines. 



DIPLOCRINUS CAROLINAE, n. sp. 

 Plate 1, fi^. 3: plate 2. fig. 5 



Locality. — Caroline station 47; west of Puerto Rico (lat. 18° 17^05" 

 N., long. 67°24'45" W.) ; 280 to 340 fathoms; February 13, 1933. 

 One specimen (U.S.N.M. no. E.3124 [type]). 



Description. — The stem as preserved is 47 mm long and, in section, 

 is pentagonal with broadly rounded angles. Tliere are seven conijilete 

 internodes. six of five and one of six columnals. The columnals 

 alternate thick and thin, the thick ones being twice as high as the 

 thin ones or even higher, and some of the thin ones being incomplete. 



The cirri are about 25 mm in length and consist of 26 to 20 seg- 

 ments, of which the first 6 have a single dorsal tubercle and those 

 following have two dorsal tubercles, a proximal and a distal, with 

 often a small tubercle between them. The ])enultiniate segment is 

 entirely smooth dorsally. The terminal claw is short, stout, and 

 strongl}^ curved. 



There are exactly 30 arms, which are about 75 mm long from the 

 radials. Each post-radial series bears two 1 1 Br series, and each of 

 these bears externally a IIIBr series, so that the arms on each post- 

 radial series are six, arranged in 2,1,1,2 order. The division series 

 are only slightly rounded dorsally and ha\'e broadly and sharply flat- 

 tened sides so that the basal portion of the crown is very compact. 



Remarks. — This new species is closely related to D. luaclearanus 

 (Wyville Thomson ). which was dredged by the Challenger ofif Barra 

 Grande, south of Pernambuco, Brazil ( lat. 9°05' S., long. 34°5o' W.), 

 in 350 fathoms on ."September 10, 1873, from which it dififers in having 

 a larger number of internodals, in having more segments in the cirri, 

 and in having the cirri i)rovided with prominent dorsal tubercles. 



